If you are still looking for an alternative, https://lemmy.zip/ is a solid choice. Similar moderation policy than lemm.ee.
Monthly reports: https://lemmy.zip/post/39959863
Lots of lemm.ee users moving there: https://lemmy.zip/post/40323214
If you are in the UK (where lemmy.zip is geoblocked due to UK laws), https://feddit.uk/ is a good option.
You can export your subscriptions, blocks and saves from “Settings - Import/Export settings” and then import them on your new account.
If that means making sure old content is still reachable in an “authoritative” way (eg.: being able to retain some sort of permaURL), I’m all for it and would wish you all the best luck.
My idea was to serve it in a way that would allow ActivityPub clients to resolve content still, while having a light static render for other clients for local content.
For content on other instances it would probably require some kind of lightweight redirection service towards the original item to be set up to prevent breaking those URLs.
This could probably be built just from scraping, without requiring database access.